HELLLLLLLLLLLLP ME PLS 10 points pls


What do the symbols in parenthesis indicate?

CaCl2(aq) + 2AgNO3(aq)) → Ca(NO3)2(aq) + 2AgCl(s)


1 the catalyst used in the reaction


2 the number of atoms of each reactant and product


3 the physical state of each reactant and product


4 the number of units of each reactant and product